Purifying steel
US4667939A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1986 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Mar 26, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21C7/0006
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of purifying steel in a tundish, especially to remove alumina inclusions, comprises passing the steel through at least one refractory board having apertures through it and introducing inert gas into the steel at the upstream side of the foot of the board to cause a stream of bubbles to flow over the upstream side of the board. One of the boards may comprise a ceramic filter element. The boards may be non-vertical and have integral gas supply means. The apertures may taper, may have axes angled from perpendicular to the board's plane and may have high alumina content surfaces. The upstream side of the board may have an exothermic layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.